package com;

public class Demo09 {
    public static void change(int []arr){
       arr[0]=200;
    }
    public static void main(String[]args){
        int [] arr = {100};
        System.out.println("调用change前="+arr[0]);
        change(arr);
        System.out.println("调用change后="+arr[0]);
    }
}
